01 - Place a cast-iron skillet or griddle over high heat and allow it to get shimmering hot, approximately 5 minutes.
02 - Divide the ground beef into 4 equal loosely packed balls. Do not season at this stage.
03 - Butter the inside halves of each burger bun. Place them buttered-side down in the skillet and toast until golden brown. Remove and set aside.
04 - Place the beef balls onto the hot skillet. Immediately press each ball flat to about ¼-inch thickness using a sturdy metal spatula pressed over parchment paper. Season the top generously with salt and freshly ground black pepper.
05 - Cook the patties for 1½ to 2 minutes until crisp edges form and juices rise to the surface. Flip each patty and immediately place one slice of cheese on top.
06 - Continue cooking for 1 more minute until the cheese is fully melted. Remove patties from the skillet.
07 - Spread the prepared burger sauce on the bottom half of each toasted bun. Layer with lettuce, tomato slices, pickles, and red onion rings. Place the cheesy patties on top and cap with the bun tops. Serve immediately.